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Showing content with the highest reputation on 12/31/2019 in all areas
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Re teeth ratio - are you familiar with the Looney Gears ? It's a toy with asymmetric sun + planet gears that have prime numbers of teeth. The game is to work out how many times you have to rotate the sun gear to get all the gears lined up. There's also Somsky gears, with an extra cog. My version -1 point